Everything (see comments)
What does not
What was not tested
I needed to set virtual desktop because I have widescreen (1280x800), or game will crash. Also, I needed to set directory where is mounted disk2 as virtual cd-drive in winecfg and changed in registry HKLM->Software->New World Computing->Heroes of Might and Magic III->CDDrive to letter of this CD drive.
|Operating system||Test date||Wine version||Installs?||Runs?||Used|
|Show||Arch Linux||Aug 05 2011||1.3.25||Yes||Yes||Platinum||an anonymous user|
|Show||Ubuntu 11.04 "Natty" i386 (+ variants like Kubuntu)||May 20 2011||1.3.20||Yes||Yes||Gold||an anonymous user|
|Show||Mac OS X 10.6 "Snow Leopard"||Feb 03 2011||1.2.2||Yes||Yes||Silver||an anonymous user|
|Current||Arch Linux||Jul 17 2009||1.1.25||Yes||Yes||Gold||an anonymous user|
|Show||Fedora 10||Jan 17 2009||1.1.9||Yes||Yes||Gold||an anonymous user|
To get multiplayer working, you need native directplay dlls. The old howto had a link pointing to outdated directplay dlls which cause problems with wine and generally don't work as expected. However with the latest dplay from DirectX 9.0c multiplayer is (almost - see note for details) flawless.
In the wine wiki is described how to get native direct play dlls.
Personally I would recommend using winetricks directplay which installs dplay dlls and sets overwrite in winecfg, however you may choose do install manually those files in which case you need to:
You can now play Heroes 3 in HD, utilizing the full size of your screen, thanks to Heroes3HD mod. It doesn't change anything gameplay wise.
With recent Wine releases, Wine prefixes are set to Windows 7. Currently, it causes rendering issues when HD or HD+ mod are installed.
winecfg and setting the Windows version to Windows XP solves the rendering issues.